UPDATE: Ahhh, YouTube, good stuff that. Here's the specific scene from Ballot Box Bunny that I'm thinking of. Not a perfect parallel, but close enough, use the bad guy's orneriness against him might be the way to go, so long as the bad guys are the ones that end up going KABOOM.

Of course, that wasn't the first use of the booby trapped piano, it was first used in the Private Snafu cartoon below

But Bugs used similar techniques to great effect, and Kim Jong Il really does seem like a Looney Tunes bad guy, so maybe Looney Tunes techniques will be most effective.